Any idea?

[Haless77]

hi guys, I am new in this form and I would like to thank everybody in advance for your help. I have a Nissan patrol gu4 direct injection 2005. I upgraded the exhaust to 3" and I noticed that it doesn't accelerate when I push the pedal down, especially when I'm towing the boat. moreover, I have a strange peak on the boost between 1.5 to 2 bar, and with normal driving, on the motorway, the boost is always between 0.5 to 1 bar. The thing get worse when I am towing the boat.... PLEASE I don't know if its remap problem, manifold dirty please I am confused

[pollenface]

You need to blank the EGR and add manual boost control to stop the boost fluctuating. 16psi (1.1bar) is a safe starting point. Cleaning the intake manifold will definitely help, then add a catchcan to help keep it clean.

http://3barracing.com/nissan-patrol-instructions/